ASP.NET下载文件几种方式

ASP.NET下载文件几种方式

2013年09月29日 09:23供稿中心： 课工场

摘要：protected void Button1_Click(object sender, EventArgs e) {...

protected void Button1_Click(object sender, EventArgs e)   {

 /*   微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite   下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。   代码如下：   */

 Response.ContentType = "application/x-zip-compressed";  

 Response.AddHeader("Content-Disposition", "attachment;filename=z.zip");  

 string filename = Server.MapPath("DownLoad/aaa.zip");  

 Response.TransmitFile(filename);  

 }

 //WriteFile实现下载  

protected void Button2_Click(object sender, EventArgs e)   {  

/*   using System.IO;       */

 string fileName ="aaa.zip";//客户端保存的文件名  

string filePath=Server.MapPath("DownLoad/aaa.zip");//路径

 FileInfo fileInfo = new FileInfo(filePath);  

Response.Clear();  

Response.ClearContent();  

Response.ClearHeaders();  

Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);  

Response.AddHeader("Content-Length", fileInfo.Length.ToString());  

Response.AddHeader("Content-Transfer-Encoding", "binary");  

Response.ContentType = "application/octet-stream";

 Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");

 Response.WriteFile(fileInfo.FullName);   Response.Flush();   Response.End();  

}

 //WriteFile分块下载  

protected void Button3_Click(object sender, EventArgs e)   {

   string fileName = "aaa.zip";//客户端保存的文件名  

   string filePath = Server.MapPath("DownLoad/aaa.zip");//路径

   System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);

   if (fileInfo.Exists == true)  

  {  

       const long ChunkSize = 102400;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力  

       byte[] buffer = new byte[ChunkSize];

       Response.Clear();  

       System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);  

       long dataLengthToRead = iStream.Length;//获取下载的文件总大小  

       Response.ContentType = "application/octet-stream";

       Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));

   while (dataLengthToRead > 0 && Response.IsClientConnected)

   {  

       int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小  

       Response.OutputStream.Write(buffer, 0, lengthRead);   Response.Flush();

       dataLengthToRead = dataLengthToRead - lengthRead;

   }  

       Response.Close();  

   }  

}

 //流方式下载  

protected void Button4_Click(object sender, EventArgs e)  

{  

      string fileName = "aaa.zip";//客户端保存的文件名

      string filePath = Server.MapPath("DownLoad/aaa.zip");//路径

      //以字符流的形式下载文件  

     FileStream fs = new FileStream(filePath, FileMode.Open);  

     byte[] bytes = new byte[(int)fs.Length];  

     fs.Read(bytes, 0, bytes.Length);  

     fs.Close();  

     Response.ContentType = "application/octet-stream";   //通知浏览器下载文件而不是打开  

    Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));

    Response.BinaryWrite(bytes);  

    Response.Flush();  

    Response.End();

 }